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From: Tony Kimball <Anthony.Kimball@East.Sun.COM>
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Subject: bouncing mail from sites without a valid MX/A record
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[Again, I redirect to chat.]

Quoth Drew Derbyshire on Sat, 26 July:
: 
: Actually, this nukes about ~ 20 - 60 % of the SPAM off the top.
: Sites don't like their good name used by spammers, so many SPAM
: generators just generate random all number domains in .COM.
: 

Hmm.  I've received about 198 spam messages in the past 3 months.  I
don't find *any* tainted by bogus domains.  Nary a one.  In fact, they
all have valid MX records deducible from the headers, although in many
cases there is no identifiable mailbox at the corresponding smtp host.
The top three sources account for 75% of all spam recieved, and they
are Cyber Promotions, Juno, and HotMail.

My sample may not be statistically representative, but it is at least
*reality-based*.  I'd like to learn of more broadly representative
studies.